netdev - rps testing questions

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Message-ID: <AANLkTin1pC=auiFBt83YomdhVgUO8uSdvq=tPaDu0=3U@mail.gmail.com>
Date:	Mon, 17 Jan 2011 17:43:26 +0800
From:	mi wake <wakemi.wake@...il.com>
To:	netdev@...r.kernel.org
Subject: rps testing questions

I do a rps(Receive Packet Steering) testing on centos 5.5 with  kernel 2.6.37.
cpu: 8 core Intel.
ethernet adapter: bnx2x

Problem statement:
enable rps with:
echo "ff" > /sys/class/net/eth2/queues/rx-0/rps_cpus.

running 1 instances of netperf TCP_RR: netperf  -t TCP_RR -H 192.168.0.1 -c -C
without rps: 9963.48(Trans Rate per sec)
with rps:  9387.59(Trans Rate per sec)

I do ab and tbench testing also find there is less tps with enable
rps.but,there is more cpu using when with enable rps.when with enable
rps ，softirqs is blanced  on cpus.

is there something wrong with my test？
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